ci: add Ubuntu 22.04 and AlmaLinux 8 workflows for backporting#892
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The intent is to validate that future security fixes still build and
test cleanly on the oldest still-supported LTS releases of the two
mainstream Linux families, so backports can be developed against the
same CI surface as the trunk:
- ubuntu-22.04: oldest GitHub Actions runner image still available
(20.04 was retired in April 2025). Mirrors the existing
ubuntu-build.yml step list.
- almalinux-8: RHEL 8 rebuild, full support until 2029. Runs in an
almalinux:8 container on ubuntu-latest because GHA has no native
runner for the Fedora/RHEL family. Pulls libzstd/xxhash/lz4 dev
headers from PowerTools + EPEL; commonmark via pip for the man
page generator.
Both jobs follow the same paths-ignore convention as the other
workflows so a workflow-only change to one file won't fan out across
the whole CI matrix.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
The default python3 on AlmaLinux 8 is 3.6, but runtests.py uses subprocess.run(capture_output=...) and check_output(text=...) which were introduced in 3.7. Install the python39 module stream and point /usr/bin/python3 at it via alternatives so the existing shebang resolves correctly. Reproduced as: TypeError: __init__() got an unexpected keyword argument 'capture_output' at runtests.py line 75. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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The intent is to validate that future security fixes still build and test cleanly on the oldest still-supported LTS releases of the two mainstream Linux families, so backports can be developed against the same CI surface as the trunk:
Both jobs follow the same paths-ignore convention as the other workflows so a workflow-only change to one file won't fan out across the whole CI matrix.